What percentage of a tile can lack adhesive?

When reviewing condition assessment reports for houses on the market, you can usually find markings indicating loose or hollow tiles. It is important to note that even if the tiles were installed correctly, it is not uncommon for small areas of a tile’s surface to lack proper adhesion.

Generally the accepted amount of a tile’s surface area that can lack proper adhesion is 20%. This means that if a tile measures 30 × 60 centimeters, an area of approximately 6×12 cm may be hollow. 20% is the maximum so that the tile can still function properly, the tile itself should of course feel solid.

Loose or hollow tiles generally make an irritating noise that you can easily remove with ADIN.